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Seems like you need to setup the communications protocol. You need to setup the type of communication that the device you are connected too if serial port then RS232 plus baud rate data bits parity etc.

I guess there is a problem with the base station. Let me tell my story:
I got a 4820 scanner with 2020 base. All worked fine till I experimented with scanning images. After a few images (which I cannot retrieve/receive properly due to lack of software) the scanner seems dead. From time to time a short buzz sounds when triggered, but no light or else.
So I bought another 4820, a slightly different model. Seems to work fine but has to be paired with the base to get the data. Now after pairing this scanner shows the same issues as my first and refuses to scan.
I installed QiuckView and HSM-USB-Serial-Driver on a virtual machine at my MAC to flash firmware to base and scanners. But the base device does not show up in the program (althought it is shown in the USB device table). Maybe I can try on a native WindowsPC ...

When connecting to a serial port there are a couple of things that could be causing the issue. The biggest problems are usually one of these:

The app does not accept serial data.

The RS-232 settings of the scanner and serial application do not match.

The cable issue.

The data is not using the termination character the application needs.

Are you using a Symbol 25-32465-20 or CBA-R01-S07PAR cable?

If so, do you know for sure your application accepts serial data? The scanner puts the data on the COM port and the application takes it from there. A good test is to try the scanner in Hyper Terminal if you have it. It is usually listed under: Programs>Accessories>Communications.

When starting HyperTerminal you may have to go through a screen that asks for a phone number. Just enter something and click OK to get to the next screen (sorry I can not remember exactly what that screen looks like- once it is set you do not see it again.) Next will be the Connection Description window. You will name the session (name it anything you would like) then click OK. Next is the Connect To box. Select your COM port in the Connect Using box, the first three boxes do not matter. When you click OK a Properties window will open. Most likely you will only have to change the Bits per second to 9600 and the Flow control to None. When you click OK your session should be active. You will have a blinking cursor in the upper left corner and in the bottom left portion of the window you should see the session time counting up. You can now try to scan a barcode. If the data shows up you know the scanner and cable are both working.

i think i can help u with this, if u unscrew the unit and carefully unhook ur the cables in side then will see two Philips screws, unscrew them and unhook the display cable its on the sidenow gently try to take the board out and put it back on then hook the display cable back and screw the board back and for the scanningunhook and re hook ur scan cable that will make it work,i hope that will solve ur problem